CCDL Permit Prep

Conocimientos generales · página 6 de 19

Preguntas de Conocimientos generales 101–120

Parte del banco de 376 preguntas de Conocimientos generales. Cada respuesta cita el Manual CDL de FMCSA o la norma federal de donde proviene.

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  1. Traducción en revisión. Se muestra el contenido actualizado en inglés. The correct technique for descending a long, steep grade is:

    • APump the service brakes repeatedly at full pressure
    • BUse the highest gear and ride the brakes continuously
    • CSelect a gear before the descent that lets engine braking control speed, using service brakes brieflyCorrecta
    • DUse the trailer brake only, leaving the tractor's brakes and engine braking unused

    Before starting a steep descent, shift into a low gear (not neutral) so the engine provides braking. Apply the service brakes just hard enough to feel a definite slowdown; when speed is approximately 5 mph below the selected safe speed, release the brakes. The brake application should last about 3 seconds. Repeat as needed.

    FMCSA Commercial Driver's License Manual (2005 CDL Testing System) · Section 2.16.2 and 2.16.4 — Select the Right Gear before Starting Down the Grade; Proper Braking Technique · verificado 2026-09-08

  2. Traducción en revisión. Se muestra el contenido actualizado en inglés. According to the CDL manual, what problem do strong winds cause?

    • AThey make it difficult to stay in your laneCorrecta
    • BThey reduce engine power
    • CThey lower tire pressure
    • DThey disable the brakes

    The manual says strong winds make it difficult to stay in your lane, usually worse for lighter vehicles and especially bad coming out of tunnels.

    FMCSA Commercial Driver License Manual (July 2014) · Section 2.7.6: Space for Turns / Strong Winds (Section 2 Driving Safely) · verificado 2026-09-25

  3. Traducción en revisión. Se muestra el contenido actualizado en inglés. According to the CDL manual, how does the following distance rule change above 40 mph?

    • AAdd 1 second to the one-second-per-10-feet-of-vehicle-length ruleCorrecta
    • BSubtract 1 second
    • CIt stays the same at every speed
    • DUse exactly 2 seconds

    The manual says to leave at least one second per 10 feet of vehicle length below 40 mph and add 1 second at greater speeds.

    FMCSA Commercial Driver License Manual (July 2014) · Section 2.7.1: Space Ahead · verificado 2026-09-25

  4. Traducción en revisión. Se muestra el contenido actualizado en inglés. According to the CDL manual, when should you use the four-way emergency flashers?

    • AWhen you are driving very slowly or are stoppedCorrecta
    • BWhenever you are driving in the rain
    • CWhen exiting a freeway
    • DOnly when driving faster than traffic

    The manual says to use the four-way emergency flashers when driving very slowly or stopped, to warn following drivers.

    FMCSA Commercial Driver License Manual (July 2014) · Section 2.5.1: Signal Your Intentions · verificado 2026-09-25

  5. Traducción en revisión. Se muestra el contenido actualizado en inglés. Per the CDL manual's vehicle inspection, which item should you check for?

    • AA properly charged and rated fire extinguisherCorrecta
    • BThe trailer's retail sales price
    • CYour passengers' luggage tags
    • DA radio station preset

    The manual's inspection lists emergency equipment including a properly charged and rated fire extinguisher.

    FMCSA Commercial Driver License Manual (July 2014) · Section 2.1: Vehicle Inspection (emergency equipment) · verificado 2026-09-25

  6. Traducción en revisión. Se muestra el contenido actualizado en inglés. For a power unit not used to transport hazardous materials, what fire-extinguisher minimum does 49 CFR 393.95 allow?

    • AOne extinguisher rated at least 5 B:C, or two each rated at least 4 B:CCorrecta
    • BAny size if kept anywhere in the cab
    • COnly one extinguisher rated at least 10 B:C
    • DA new extinguisher each month regardless of condition

    For this non-hazmat case, the rule allows one 5 B:C extinguisher or two 4 B:C extinguishers. Required extinguishers must be marked with the rating, fully charged, readily accessible, and securely mounted. Placarded hazmat power units need at least 10 B:C.

    Electronic Code of Federal Regulations · 49 CFR 393.95(a)(1)-(4) · verificado 2026-09-08

  7. Traducción en revisión. Se muestra el contenido actualizado en inglés. Why must cargo weight be balanced side to side?

    • AIt affects fuel economy, not vehicle stability or handling
    • BIt matters for refrigerated trailers, not dry van freight
    • CSide-to-side balance affects appearance, not how the truck handles
    • DUneven weight can make the vehicle lean or roll over more easilyCorrecta

    Uneven side-to-side loading can affect vehicle balance and handling and increase rollover risk, so cargo weight should be distributed evenly.

    FMCSA Commercial Driver License Manual · Cargo balance · verificado 2026-09-08

  8. Traducción en revisión. Se muestra el contenido actualizado en inglés. When checking your CDL vehicle before a trip, which item must be secure before you move?

    • ACargo, doors, and emergency equipmentCorrecta
    • BThe fuel cap, since spillage is the main pre-trip concern
    • CThe mirrors; other items can be checked once en route
    • DThe radio and dashboard electronics

    A pre-trip inspection must confirm cargo is secured, doors are latched, and required emergency equipment is present and accessible before the vehicle moves. Federal emergency equipment includes a fire extinguisher and stopped-vehicle warning devices. Spare fuses are not federally required, though a carrier may carry them.

    eCFR 49 CFR 393.95 — Emergency equipment on all power units · 393.95(a), (f), and (g); paragraph (b) reserved · verificado 2026-09-07

  9. Traducción en revisión. Se muestra el contenido actualizado en inglés. For accessible cargo subject to § 392.9(b), what must the driver inspect within the first 50 miles of the trip?

    • AThe fuel, oil, and washer-fluid levels before the next fuel stop
    • BThe shipping papers, to confirm the load matches the bill of lading
    • CThe tire tread depth and inflation on every axle of the vehicle
    • DThe cargo and its load-securement devices, making needed adjustmentsCorrecta

    Inspect the cargo and securement within the first 50 miles and correct problems. The section has exceptions for certain sealed or impracticable-to-inspect loads. This particular duty does not replace other vehicle inspections.

    49 CFR § 392.9 · 392.9(b)(2) first 50 miles; (b)(4) exceptions · verificado 2026-09-29

  10. Traducción en revisión. Se muestra el contenido actualizado en inglés. Under federal hours-of-service rules, what is the maximum driving time for a property-carrying driver after 10 consecutive hours off duty?

    • A11 hoursCorrecta
    • B8 hours
    • C14 hours of driving
    • D16 hours

    49 CFR 395.3(a)(3) limits a property-carrying driver to 11 hours of driving after 10 consecutive hours off duty. The 14-hour limit in 395.3(a)(2) is the on-duty window, not driving time.

    49 CFR § 395.3 · 395.3(a)(2) 14-hour period; (a)(3) driving time · verificado 2026-09-29

  11. Traducción en revisión. Se muestra el contenido actualizado en inglés. When driving a long commercial vehicle, why should you make turns slowly?

    • AIt's a courtesy to other drivers
    • BOff-tracking can cause the rear wheels to cut across curbs or lanesCorrecta
    • CIt matters for tight parking-lot maneuvers, not road turns
    • DIt reduces engine wear more than it affects vehicle control, a claim with no basis in fact

    The rear wheels of a long vehicle follow a shorter, tighter path than the front wheels during a turn (off-tracking). Turning too quickly increases this effect and can cause the rear wheels to strike curbs, medians, or adjacent lanes.

    FMCSA Commercial Driver License Manual (July 2014) · Section 2.7.6: Space for Turns · verificado 2026-09-25

  12. Traducción en revisión. Se muestra el contenido actualizado en inglés. If a steer tire fails at highway speed, what should you do first?

    • ABrake hard immediately to stop as quickly as possible
    • BSteer sharply away from the side of the failed tire
    • CGrip the wheel firmly and maintain control before brakingCorrecta
    • DAccelerate briefly to help stabilize the vehicle's weight transfer

    A steer tire blowout at speed can pull the vehicle sharply to one side. Gripping the wheel firmly and maintaining directional control comes before braking, since sudden hard braking during the initial pull can worsen loss of control.

    FMCSA Commercial Driver License Manual (July 2014) · Section 2.17.4: Tire Failure · verificado 2026-09-25

  13. Traducción en revisión. Se muestra el contenido actualizado en inglés. When evaluating a power unit and its trailers together, what does GCWR mean?

    • AGross Cab Weight Requirement
    • BGeneral Cargo Weight Ratio
    • CGross Combination Weight RatingCorrecta
    • DGovernment Carrier Weight Rule

    GCWR means Gross Combination Weight Rating. Under 49 CFR § 383.5, it is the greater of the manufacturer's GCWR for the power unit or the sum of the GVWRs or actual gross vehicle weights of the power unit and towed units, whichever produces the highest value.

    49 CFR § 383.5 (current eCFR) · Definitions — Gross combination weight rating (GCWR) · verificado 2026-09-08

  14. Traducción en revisión. Se muestra el contenido actualizado en inglés. A commercial driver may legally hold a CDL from:

    • AAs many states as they work in
    • BAny state plus a federal CDL
    • CTwo neighboring states
    • DOnly one state at a timeCorrecta

    Federal law allows a driver only one CDL, issued by the home state, so violations follow the driver and cannot be hidden.

    49 CFR § 383.21 · No person may have more than one license · verificado 2026-09-08

  15. Traducción en revisión. Se muestra el contenido actualizado en inglés. During normal CMV driving, using a hand-held mobile phone is:

    • AProhibited by federal regulation, subject to limited exceptionsCorrecta
    • BAllowed only on highways
    • CAllowed below 30 mph
    • DAllowed for dispatch calls

    Federal rules generally prohibit hand-held mobile-phone use while driving a CMV, subject to limited regulatory exceptions. The restriction reduces physical and visual distraction.

    49 CFR § 392.82 · Using a hand-held mobile telephone · verificado 2026-09-08

  16. Traducción en revisión. Se muestra el contenido actualizado en inglés. Federal regulations require a commercial vehicle driver to:

    • AWear a seat belt only on highways
    • BWear a seat belt at all times while the vehicle is movingCorrecta
    • CWear a seat belt only in bad weather
    • DUse a seat belt only when carrying passengers

    A buckled driver stays behind the wheel and in control during a crash or hard stop, so the belt must be worn whenever driving.

    49 CFR § 392.16 · Use of seat belts · verificado 2026-09-08

  17. Traducción en revisión. Se muestra el contenido actualizado en inglés. Under the general federal vision standard, a CMV driver must have distant visual acuity of at least:

    • A20/60 in the better eye
    • B20/20 in both eyes
    • C20/40 in each eye, with or without correctionCorrecta
    • D20/100 with glasses

    The general FMCSA standard requires at least 20/40 acuity in each eye and a 70-degree field of vision. A separate alternative vision standard may apply to a driver who does not meet the better-eye or worse-eye requirement.

    49 CFR § 391.41 · Physical qualifications - vision · verificado 2026-09-08

  18. Traducción en revisión. Se muestra el contenido actualizado en inglés. A CMV driver's medical examiner's certificate (DOT medical card) is generally valid for a maximum of:

    • A6 months
    • B5 years
    • C12 months
    • D24 monthsCorrecta

    A standard DOT medical card lasts up to 24 months; a driver with certain conditions may be certified for a shorter period.

    49 CFR § 391.45 · Medical examiner's certificate · verificado 2026-09-08

  19. Traducción en revisión. Se muestra el contenido actualizado en inglés. In commercial-driver safety guidance, what does the term “No-Zone” describe?

    • AA zone where CDLs are not required
    • BThe large blind areas around a commercial truck where other road users may not be visible to the driverCorrecta
    • CA no-parking area at truck stops reserved for CMVs
    • DThe area inside a weigh station

    No-Zones are blind areas in front of, behind, and beside a large truck where other road users may disappear from the driver's view.

    FMCSA Commercial Driver's License Manual · Section 2.6 - Seeing Hazards · verificado 2026-09-08

  20. Traducción en revisión. Se muestra el contenido actualizado en inglés. What is included in a commercial vehicle's perception distance?

    • AThe distance traveled while the brakes bring the vehicle to a stop
    • BThe distance the vehicle travels from when you see a hazard until your brain recognizes itCorrecta
    • CThe distance from your bumper to the vehicle ahead
    • DThe distance covered during a lane change

    Perception distance is how far you travel from spotting a hazard until your brain identifies it, and it adds to total stopping distance.

    FMCSA Commercial Driver's License Manual · Section 2.6 - Stopping Distance · verificado 2026-09-08

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